Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#12
07-28-2011, 10:08 PM
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Re: COPO 9511
The 9511 should have two letters after it to designate the axle ratio and type of ring and pinion.
The 9511 codes for a Nova that got a 4.56 and a COPO Camaro that got a 4.56 would have different suffixes. The Nova would have received a standard duty 4.56 ring and pinion set (3862527-3862515) while the COPO Camaro/Chevelle would received a 3917973 (HD 4.56)(3916230-3916231) ring and pinion set. The same applies for the 4.88s. I know of a few COPO Camaros that have original "BE" rears with the original 3917973 (4.56) gears. Two have window stickers that have the same suffix after the 9511 optional ratio code. Hope this helps. 
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